allow changing the stop-point of wavesurfer during playback (katspaug…

…h#1795)

* allow changing the stop-point of wavesurfer during playback

When someone is playing back a loop or region, this allows for moving
the loop-point while playback is happening.

* add version marker

* clear last callback when adjusting playEnd

src/mediaelement.js

@@ -314,10 +314,11 @@ export default class MediaElement extends WebAudio {
     /**
      * Set the play end
      *
-     * @private
      * @param {number} end Where to end
      */
     setPlayEnd(end) {
+        this.clearPlayEnd();
+
         this._onPlayEnd = time => {
             if (time >= end) {
                 this.pause();

src/wavesurfer.js

@@ -767,6 +767,16 @@ export default class WaveSurfer extends util.Observer {
         return this.backend.play(start, end);
     }
 
+    /**
+     * Set a point in seconds for playback to stop at.
+     *
+     * @param {number} position Position (in seconds) to stop at
+     * @version 3.3.0
+     */
+    setPlayEnd(position) {
+        this.backend.setPlayEnd(position);
+    }
+
     /**
      * Stops and pauses playback
      *

src/webaudio.js

@@ -111,7 +111,7 @@ export default class WebAudio extends util.Observer {
         this.lastPlay = this.ac.currentTime;
         /** @private */
         this.startPosition = 0;
-        /** @private  */
+        /** @private */
         this.scheduledPause = null;
         /** @private */
         this.states = {
@@ -656,7 +656,7 @@ export default class WebAudio extends util.Observer {
 
         this.scheduledPause = end;
 
-        this.source.start(0, start, end - start);
+        this.source.start(0, start);
 
         if (this.ac.state == 'suspended') {
             this.ac.resume && this.ac.resume();
@@ -715,4 +715,14 @@ export default class WebAudio extends util.Observer {
             this.play();
         }
     }
+
+    /**
+     * Set a point in seconds for playback to stop at.
+     *
+     * @param {number} end Position to end at
+     * @version 3.3.0
+     */
+    setPlayEnd(end) {
+        this.scheduledPause = end;
+    }
 }